S-99091A105 4-40 x 3/16" Plastic Hex Head Screws

Key Features & Benefits at a Glance

• Corrosion-free performance with durable Nylon Plastic construction, ideal for humid or chemical environments without risk of rust.
• Easy installation and removal thanks to the external hex drive design, allowing for quick tool engagement with standard wrenches.
• Reliable thread engagement with Class 2A UNC coarse threads, ensuring consistent fit and reduced cross-threading in various materials.
• Broad temperature tolerance from -40° to 185°F, maintaining integrity in both freezing and elevated heat conditions.
• Lightweight and non-conductive properties, perfect for electrical insulation and reducing overall assembly weight.
• Environmental compliance with RoHS 3 standards, meeting global regulations for hazardous substance restrictions.
• Full threading for maximum grip along the 3/16" length, providing uniform clamping force across the entire fastener.

Professional Applications & Engineering Value

These 4-40 UNC Nylon Plastic Hex Head Screws deliver exceptional value in industries where metal fasteners fail, such as electronics, automotive, and outdoor equipment. The black nylon material offers inherent resistance to corrosion, chemicals, and electrical conductivity, eliminating galvanic corrosion risks and short circuits. With a coarse thread and Class 2A fit, they provide quick assembly and reliable holding power in plastic or soft metal components, reducing installation time and thread stripping. The external hex drive ensures high torque application without slippage, while the temperature range from -40° to 185°F ensures stability in varying operational environments, making them a versatile, RoHS compliant solution for durable, non-metallic fastening needs.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A thread fit for standard tolerance, a thread diameter of 0.112", and full threading along the 3/16" length. The hex head dimensions are 1/16" in height and 3/16" in width, with a right-hand thread direction. It complies with RoHS 3 (2015/863/EU) regulations, ensuring adherence to hazardous substance restrictions for safe use in industrial and consumer applications.